Remove unnecessary simd-json feature gate (#252)

* Remove unneccessary simd-json feature gate

* Fix redundant closure warning

src/error.rs

@@ -2,7 +2,6 @@
 
 #[cfg(feature = "serenity")]
 use futures::channel::mpsc::TrySendError;
-#[cfg(not(feature = "simd-json"))]
 pub use serde_json::Error as JsonError;
 #[cfg(feature = "serenity")]
 use serenity::gateway::ShardRunnerMessage;

src/input/sources/ytdl.rs

@@ -168,7 +168,7 @@ impl<'a> YoutubeDl<'a> {
             .stdout
             .split(|&b| b == b'\n')
             .filter(|&x| (!x.is_empty()))
-            .map(|x| serde_json::from_slice(x))
+            .map(serde_json::from_slice)
             .collect::<Result<Vec<Output>, _>>()
             .map_err(|e| AudioStreamError::Fail(Box::new(e)))?;